墙上有个地图怎么说英语

If you are referring to a map that is displayed on a wall, you can say "There is a map on the wall." If you want to specify that it is a physical map, as opposed to a digital map on a device or computer, you can say "There is a physical map on the wall." You can also use the phrase "hanging on the wall" to describe the map's location, as in "There is a map hanging on the wall."