Dalian has a sea surface of over 30,000 square kilometres and the coastline stretches for 1,906 kilometres. The city teems with marine aquatic products. The shallow water along the Dalian coast is particularly suitable for breeding seaweed. Over 40 different kinds of mineral resources, scattered over 500 sites, have already been verified in the region. Diamond reserves rank first in the country, and their quality is amongst the best in the world. Mineral deposits include limestone, dolomite, asbestos, quartzite, coal, iron and copper .