A stream,river or another body of water.
It is called the scale.
It usually means water.
A blue line. It will also be annotated (in blue) "canal" or given a name eg. Shropshire Union Canal.
On a weather map, the symbol for a cold front is a blue line with blue triangles facing the direction that the front is moving.
A blue line on a map is a lake ,river , or body of water
Water represents a blue line on a map.
The blue line on a map usually represents a stream of water!
a blue line on a map means that it is water weather it is a stream river or lake
an equator line
A wavy blue line on a map usually indicates water. I could indicate a river, canal, or any type of waterway.
I am guessing that's a river.
equeater
the blue line represents Lakes, Streams , canal and mainly just water
its called an index or index conotour line and is every fitth line on a topographic map.
The horizon
A stream,river or another body of water.