The Maritime Alps are drained by the rivers Roya, Var and Verdon and their tributaries on the French side; by the Stura di Demonte and other tributaries of the Tanaro and Po on the Italian side. There are many attractive perched villages, such as Belvédère at the entrance to the spectacular Gordolasque valley, some concealing unexpected architectural riches (for example in the south there are numerous churches decorated with murals and altar pieces by primitive Niçois painters).