description Lake Mainit Overview
Lake Mainit is a freshwater lake located in the northeastern part of Mindanao in the Philippines, spanning the provinces of Surigao del Norte and Surigao del Sur. Reaching a maximum depth of roughly 223 meters, it is recognized as the fourth-largest and one of the deepest lakes in the country. The lake provides essential livelihoods through fishing and agriculture for the surrounding local communities and hosts several endemic aquatic species.
help Lake Mainit FAQ
Which provinces border Lake Mainit?
Lake Mainit lies in northeastern Mindanao and is shared by Surigao del Norte and Agusan del Norte, not Surigao del Sur. Its lakeshore municipalities include Mainit, Alegria, Kitcharao, and Jabonga. [DA-NFRDI](https://repository.nfrdi.da.gov.ph/bitstreams/fb968cb4-370a-414d-b092-df44e2026049/download)
How deep is Lake Mainit, and how large is it?
It reaches about 223 meters and covers about 173.4 square kilometers, making it the Philippines' deepest and fourth-largest lake. Figures vary slightly by survey, but 223 meters and 173.4 square kilometers are commonly cited planning figures. [DA-NFRDI](https://repository.nfrdi.da.gov.ph/bitstreams/fb968cb4-370a-414d-b092-df44e2026049/download)
How does Lake Mainit drain?
The lake has one main outlet, the Kalinawan River, which flows toward Butuan Bay. Studies describe 28 tributaries feeding the lake and many fish moving between the lake and the bay through this river. [SEAFDEC](https://repository.seafdec.org.ph/handle/10862/5867)
What fish is Lake Mainit known for?
The native white goby, Glossogobius giuris, is locally called pijanga and is one of the lake's important fishery resources. Government restocking and conservation programs have specifically mentioned protecting pijanga while managing invasive fish and fishing pressure. [Department of Agriculture](https://www.da.gov.ph/basil-program-ensures-balik-sigla-of-lake-mainit/)
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