A woman in a red shirt looks at a map while with a view of a river and several boats in the background.
A woman looks at a map outdoors, a river and boats are behind her.
A woman in a red shirt looks at a map entails woman looking at map outdoors as part of the description of a river and boats in the background or behind her.
The view of river can be found only in the outdoors
Woman in a red shirt is a type of woman, and river implies outdoors.