Kaynarca, formerly Şeyhler, is a municipality and district of Sakarya Province, Turkey.

[1] The mayor is Murat Kefli (AKP).

The nature reserve Acarlar Floodplain Forest, which is Turkey's biggest mono-bloc floodplain forest, is located northeast of Kaynarca.

[4] There are 45 neighbourhoods in Kaynarca District:[5]

This geographical article about a location in Sakarya Province, Turkey is a stub.