The Ismar is a right tributary of the river Câlniștea in Romania. It discharges into the Câlniștea in Naipu. It flows through the villages Radu Vodă, Dimitrie Cantemir, Izvoarele, Chiriacu and Petru Rareș. Its length is 27 km (17 mi) and its basin size is 161 km2 (62 sq mi). References. https://en.wikipedia.org/wiki/Ismar