National parks and reserves

Romania's only volcanic lake: an almost round sheet of water in the Ciomatu crater, ringed by forest, with a Catholic chapel on the shore and the Mohoș peat bog in the neighbouring crater.

A natural dam lake formed in 1837, when a mountainside blocked the Bicaz valley; the trunks of the drowned forest still rise from the water, at the upper end of the Bicaz Gorge.