mostly rivers, but it could also be streams
A stream,river or another body of water.
lakes probably
On an Ordnance Survey map, a waterfall is represented by a blue triangle pointing downward. This symbol indicates the location of the waterfall within the landscape. Additionally, the surrounding water features may also be marked with blue lines to represent rivers or streams.
Lines that are close together on a map typically indicate a steep slope or elevation change. The closer the lines, the steeper the terrain. These lines are called contour lines and are used to represent the shape of the land and its features.
Points on a map are connected by lines, which are known as routes or paths. These lines represent the physical or conceptual connections between the points, such as roads, rivers, or airline routes. By following these lines, travelers can navigate from one point to another on the map.
the Borders
A stream,river or another body of water.
Blue on a map usually denotes water. Blue lines could be streams and rivers.
Water represents a blue line on a map.
Blue on a map usually represents water. If it is a road map, blue is often the smaller roads.
The blue line on a map usually represents a stream of water!
The black lines mean it is a state boundary.
blue
Blue lines
air pressure
Hachured contour lines on a topographic map indicate a depression or a hole in the ground. They are lines that have small perpendicular lines extending from them, pointing inward toward the depression or lower elevation area they represent.
state border.