Zeimena is the river located in the east of Lithuania. Its length is 82 kilometers (some estimates – 114 km). Headwaters of the river are besides the Labanoras forest, it outflows from Zeimenis lake. This is a typical Highland river, flowing through the sandy and steep pinewoods, often curves around swamps overgrown with alders. Almost the whole river flows through the Svencionys district, just near the confluence of Neris river it flows into Svencionys-Vilnius districts’ periphery. All major Highland National Park lakes are joined with Zeimena in Zeimenis lake. Headwaters of Zeimena are located by the small town of Kaltanenai and flows through Svencioneliai and Pabrade into the river Neris. There is Vilnius-St. Petersburg railway line along the river Zeimena and therefore it is a convenient place for holidaymakers to have rest in nature of the river or the forests of Labanoras wood. Zeimena is one of the cleanest rivers in Lithuania, there are no barriers, as a matter of fact it is considered being the main Lithuanian salmonid spawning.
Lakaja is eastern Lithuania river, 29.1 km long, located in Svencionys district; it is the most liquid affluent of Zeimena, outflowing from the Juodieji Lakajai lake, meets Zeimena at Santaka. As the river is fed by lakes, the water level fluctuates in the low range. Lakaja flows through the Regional Park of Labanoras, passes Aldikis and Lakaja lakes. Persoksna meets Lakaja just in six kilometres left to the mouth of the drains of the river. These are larger settlements located by Lakaja: Lakaja, Fedariskiai, Zukaucizna, Vilkaslastis and Santaka. Lakaja is often admired by tourists due to its picturesque banks and a simple route. The flow of the river is quite calm, there are no shoals, however at some places there may be some blockages or low bridges.
Kiauna is a small river in the districts of Ignalina and Svencionys with the length of 16 km. It outflows from Kiauna lake (the district of Ignalina) and flows into Zeimena river (the district of Svencionys) next to Sakaliskes village, by the small town of Kaltanenai. During the Soviet era a straight artificial channel into the lake Gilutas was excavated. Due to an artificial river channel Kiauna now flows through Gilutas lake; sadly enough the lake starts to overgrow at the place where the river flows into
the lake. Prior to that, Kiauna was flowing through its natural bed channel through Sklenskas and Sekluotis lakes into the riverZŽeimena. Sklenskas lake was reclaimed many times and therefore there is a Kuriniai swamp instead of the lake. The river is fed by water sources and is mostly sandy, with a lot of torrential places, fenny sites and swampy areas in and around it. The following villages are located at Kiauna: Pakiaunys, Stirnine, Naujasode, Jakutiskis, Vasiuliske, Zvirbliske, Kuriniai, Pagylute, Kukliai, Sakaliske.
Zeimenys is a long and narrow lake, reminiscent of a slow flowing river (the stream is evident in many places of the lake except the bays). Zeimenys is a typical snake-shape lake extending to north-south direction. Lake Area – 454.6 ha, pool area – 750 m, length – 10.1 km (other data – 9.3 km), maximum width – 1.6 km (average width of the lake – 0.5 km) coastline – 34.2 km. The lake contains 14 islands with the maximum depth of 23.5 m, the most common depth is 6.9m. The wide junction canal connects the lake with Šakarva lake in the northern part, Laukupe and Kretuona flow into the lake in the eastern part of the lake and two nameless streams flow into the western part. Zeimena outflows the lake by Kaltanenai. The slopes of the lake are high, steep, sometimes even up to 15-20 m high, with sandy shores, covered with pine forests. The lake basin is complex, shoals alternate with swims. The coastal areas are overgrown with reeds and bulrushes which surround islands as well. Although almost 80 percent of the lake’s shoreline is overgrown with aquatic plants, it is still easy accessible and the overgrowth is quite scarce and sporadic. Underwater vegetation extends up to 5-6 m deep, shoals and bays are mostly rank parts of the lake. The central lake bed is carpeted with silt, the banks are either sandy or gravelled. Bajorai, Ozkiniai, Antanavas villages and Kaltanenai town are located round the lake.
Juodieji Lakajai is a lake located in the eastern Lithuania which is in the district of Moletai, about 12 km to the east of Moletai, in the Regional Park of Labanoras. The length of the lake reaches 6.2 km and its maximum width – 1.2 km. The coastline is very wavy. Banks are very dry, overgrown with forests. There are eight islands in the lake making up the total area of 7.2 hectares. There are some peninsulas in the north and north-eastern part of the lake. The bar is narrow, covered with sand. There are deep ravine at the bottom, covered with silt. The lake connects with Baltieji Lakajai at the strait of the lake which lies in the western part of the lake and is 150 meters long. Lakaja outflows in the east of the lake (affluent of river Zeimena) and in the south of the lake Kertuojai a river Kertuoja flows into. There are different kinds of fish caught in Juodieji Lakajai: vendace, smelt, roach, bleak, pike, redeyes, tench, perch, bream breed and eel. There are Kertuojos and Joniskes villages located by the lake.
Baltieji Lakajai is a lake located in the eastern Lithuania, which is in the district of Moletai, about 12 km to the east of Moletai, in the Regional Park of Labanoras and belongs to the basin of Lakaja (the basin of Zeimena and Neris). The lake is extended to west – east direction. The length of the lake reaches 8.6 km with its maximum width of 1.3 km. There are three islands covering the total area of 3.8 hectares. Along the pit there lie some waterholes which are 5-40 m deep. Rasele inflows from the lake Rasios, Kamuze – from the lake Kamuzelio, Tramys – from the lake Tramys, Rudesa – from the lake Rudesa, and Urke – from the lake Urkys. In the east the lake connects with the lake Juodieji Lakajai at the strait of Peternis which is 150m wide. These lakes belong to the regional reserve of Labanoras replete with rare animals and plants. Fish that one can find most often are perch, roach, pike, bream and redeyes. There also are eels and crayfish. There are some villages located by the lake: Rudesa, Kamuze, Grusis, Azuraisciai, Antalakaja, Apkartai, Sciurys, Palakajys, Mateliai.
Kiaunas is the lake in the eastern Lithuania, located in the Highlands, in the south-west region of Ignalina, in the periphery of Utena region. The lake extends from the north – east to the southwest direction with the length of 2,2 km, the width of about 0,5 km and the depth of 12.5m. Kiaunas is snake – shape lake with the small curved banks, flat and swampy in some places and forested in the southwest. In the southwest Aiseta inflows from the lake Aisetas and Kiauna – the affluent of Zeimena – outflows in the west. These villages are located by the lake: Kiauneliskis, Krivasalis and Zablatiske.