The region has a very high population density.

这一地区人口密度很高。

《柯林斯英汉双解大词典》

In areas of high density it looks more or less like population density.

在高密度区域，它或多或少地看起来像是人口密度。

youdao

It also cites the country's high population density as a reason for these strict measures.

它还援引该国人口密度高为采取严格的措施的理由。

youdao

It has a dangerous mix of poor sanitation, high population density and limited health services.

BBC: UK to spend ?2m combating cholera in Sierra Leone

High population density, a poor ratio of available water to demand, and regional imbalances in available water supplies are serious challenges for China in managing its usable water supply.

FORBES: Quenching China's Thirst For Water

The risk of loss of lives and economic disaster in the southern Mediterranean is high due to strong population density along its coasts: around 150 million people concentrated in 46, 000 kms of coastline, 110 million of them living in cities bordering the sea and some 200 million tourists visiting the area every year.

UNESCO: Indigenous Peoples