Add rectangle to map made with Cartopy python to select subspace

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I have made the following map with Cartopy:

MAP

import cartopy.crs as ccrs
import matplotlib.pyplot as plt

ax = plt.axes(projection=ccrs.PlateCarree())
ax.set_extent([-80, 40, 20, 90], crs=ccrs.PlateCarree())
ax.coastlines(resolution='50m', linewidth=.5, color='black') # add map
plt.show()

and I would lie to add a rectagle to indicate a subspace. The rectangle should cover the space lon = (-10,20) lat = (30,70). The output should look sth like:

Output

Any idea?

Goal

cartopy maps python
1 Answers

Just use ax.plot() command with proper options.

# (Relevant code only)
# You wont get straight lines, but great-circle arcs.
ax.plot([-10, 20, 20, -10, -10], [30, 30, 70, 70, 30],
         color='black', linewidth=1, marker='.',
         transform=ccrs.Geodetic(), #remove this line to get straight lines
         )

square

user_21774130
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