The hydrographic conditions of Bitola and its immediate surroundings are conditioned and determined by the geological, geomorphological and climatic characteristics.
The Dragor River flows through Bitola for a length of 4.5 km.
The Dragor originates from several small rivers, namely the Dihovo Dragor (12 km long, the source of which consists of several watercourses that spring from the slopes of Pelister, namely: Sapunchica, Lak Potok, Crvena Reka and Klisurica) and the Bratindolski Dragor or Boroica.
The total length of the Dragor River is 25.123 km with a watershed volume of 67 km, a basin of 188 km2 and an average fall of 17.0 ‰. The amount of water in the river depends exclusively on precipitation and groundwater of Baba and Pelister. The average flow of the Dragor River through the city from November to June is 2 – 3 m3/sec. The static groundwater level in different areas of the city is different and ranges from 0.50 m to 6.50 m.
Of the numerous wells in the city, due to urban development, their number has almost halved and in most of them the water is polluted by wastewater.
22 km from Bitola is the artificial accumulation lake “Strezevo”, which is a significant hydrographic object for Bitola and the Bitola region. This lake occupies a volume of 112,000,000 m3 of water, a depth at the dam of 72 meters, an area of about 7 km2, an average width of about 1 km and a length of 7 km.
Other hydrographic facilities are the “Dovledžik” pool, which is a compensation pool with a length of 170 m, a width of 60 m, a volume of 13,600 m3 of water, a depth of about 3 m and a capacity of 2 – 3,000 swimmers, and the “Olympic Pool” with dimensions of 50 x 25 m. , as well as one children’s pool in both places. On hot summer days, both hydrographic facilities are used for swimming and recreation. At the top of the Baba – Pelister mountain are two glacial lakes, better known as “Pelister eyes” – the Big and the Small Lakes.