On Valentine's Day of 1991, K. Endate and K. Watanabe discovered 16525 Shumarinaiko at the Kitami Observatory and named it after Shumaranai, a beautiful lake in northern Hokkaid that used to generate hydroelectric power.
It was discovered on 14 February 1991, by Japanese astronomers Kin Endate and Kazuro Watanabe at the Kitami Observatory on the island of Hokkaido in northern Japan. This minor planet was named after Lake Shumarinai. Artificially created to generate hydroelectricity in the 1940s, it is now known for its scenery. Shumarinai Prefectural Natural Park (, Shumarinai doritsu shizen koen) is a Prefectural Natural Park in northern Hokkaido, Japan. 
