Ice and snow resources can be rated as the best in the country. The ski period can last 120-140 days with good quality and heavy fall. The snow fall can reach 100-300 centimeters in a mountainous area. Slopes of mountains are moderate. There are more than 100 places fit for building large-scale ski resorts. The forestry area is 190,000 square kilometers and forest cover rate is 41.9%. Most of the forests are natural. Rivers sweep over the whole province and water resource is the richest among the provinces in the north. Rivers and lakes like the big five water system Heilongjiang River, Songhua River, Wusulijiang River, Nenjiang River and Mudanjiang River; Xingkai Lake, Jingbo Lake and Wudalianchi are grand and full of momentum.