surface           369,98 kmē                        perimeter                    158,4 km
length max.   51,6 km                             height above sealevel   65 m
width max.    17,2 km
depth max.    346m

temperatures

month                        water                       air
Dec - Feb                      6°-8°                       5°-15°
Mar - May                     9°-18°                    15°-24°
Jun - Aug                    17°-27°                    24°-32°
Sep                             22°-17°                    28°-20°
Oct - Nov                    15°-10°                    20°-10°