The marsh frog (Pelophylax ridibundus) is a species of water frog native to Europe and parts of Asia. They occur in a large part of Europe starting from western France and spreading out into the Middle East and about a quarter into Russia. There are also isolated populations in Saudi Arabia and the Russian Far East, along with some introduced populations in the United Kingdom and other places. These frogs are very lenient in their habitats, and are able to inhabit a majority of different types of water bodies. The marsh frog is the largest type of frog in most of its range, with males growing to a size around 97.86 mm (3.85 in) SVL and females 102.36 mm (4.03 in) SVL. Tadpoles can reach up to 186 mm (7.32 in) in length, but this usually occurs in places with long winters where the tadpole