What does regional scale mean?

What does National scale mean?

What does International scale mean?

1 - iterations occurring within a region, in a regional setting

i only know first one

1. regional scale includes water supply from external or remote catchments that considers impact on other communities, and the discharge of wastewater and stormwater into regional waterways.

2. The scale of a map is the ratio of a distance on the map to the corresponding distance on the ground. For example, one inch on a map is equal to one mile on the ground

3. (I have no idea)