Lake Lappajärvi
| Lake Lappajärvi | |
|---|---|
Lappajärvi is the largest lake near the lower right corner.
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| Location | Lappajärvi, Finland |
| Coordinates | 63°12′N 023°42′E / 63.200°N 23.700°ECoordinates: 63°12′N 023°42′E / 63.200°N 23.700°E |
| Type | impact crater |
| Primary outflows | Ähtävänjoki |
| Basin countries | Finland |
| Surface area | 145.49 km2 (56.17 sq mi) |
| Max. depth | 36 m (118 ft) |
| Surface elevation | 69.5 m (228 ft) |
| Islands | 56 (Kärnä) |
| References | |
Lappajärvi is a lake in Finland, in the municipalities of Lappajärvi, Alajärvi and Vimpeli. It is formed in a 23 km (14 mi) wide, partly eroded meteorite impact crater. The lake is part of Ähtävänjoki (Swedish: Esse å) basin together with Lake Evijärvi that is located downstream (north) of it.
The Lappajärvi impact structure is estimated to be 76.20 ± 0.29 million years old (Campanian stage of the Late Cretaceous time period). Experts woking on Finland's Olkiluoto nuclear waste repository project have studied Lake Lappajärvi to help them project how Finnish landscapes might look one million years in the future and beyond.
An island in the middle of the lake, Kärnänsaari (Kärnä Island), gives the name to the black impact melt rock (impactite) found there, locally called kärnäite.
The towns on the shore are Lappajärvi and Vimpeli. Although not very near any, the nearest major city is Seinäjoki.
Lake Lappajärvi
Lake Lappajärvi
Frozen in winter
Lappajarvi impactite
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Wikipedia