DSOW is the coldest, densest, and freshest water mass of NADW. Hair can range from dense (the densest hair in young calves) to sparse. Its metropolitan area is the densest in the OECD. Reefs comprise some of the densest and most diverse habitats in the world. It is one of the largest and densest educational campus in the world. It included varying terrain from high frozen Andes to the densest swamps. Shandong has one of the densest and highest quality expressway networks among all Chinese provinces. One of the densest manifestations of the megalithic phenomenon in Europe occurred in Portugal. Southern Ontario is one of the densest regions in the country. Koreatown is one of the densest neighborhoods in the United States. It is also one of the densest, exceeded only by platinum, iridium and osmium. There are many variations on the densest subgraph problem. The crater has one of the densest known population of lions, numbering 62 in 2001. To the west of downtown is one of Spokane's oldest and densest neighborhoods, Browne's Addition. This makes M59-UCD3 the densest known galaxy.