1. Ecological protection: the north is a region with good natural ecological environment. In order to protect the local ecological resources and biodiversity, we decided not to develop them and keep them in their natural state.

2. Land use planning: The local government has planned this area as green space or park land, which is used to provide places for leisure, entertainment and fitness for citizens, and no commercial or residential development is allowed.

3. Investment cost: A lot of capital and human resources are needed to develop a region, including infrastructure construction and housing construction. If the expected return of development in this area is low, or the development cost is too high, it will be decided not to develop.

4. Social opinion: local residents or relevant stakeholders have objections to the development of this area, thinking that development will destroy the environmental and ecological balance, so they decided not to develop it.