 The basin of the Oswego includes most of the inland lakes, which form a peculiar feature of the landscape in the interior of the state.The principal of these lakes are Cayuga, Seneca, Canandaigua, Skaneateles, Crooked, and Owasco lakes, all occupying long, narrow valleys, and extending from the level land in the center far into the highland region of the south (many of those lakes just mentioned are also part of the Finger Lakes).The valleys they occupy appear like immense ravines formed by some tremendous force that tore the solid rocks from their original beds, from the general level of the surrounding summits, down to the present bottoms of the lakes.