I'm late for October's theme of interesting juxtapositions of geomorphology and human landscapes, suggested by Brian Romans. So before someone selects November's theme, here is my contribution.
We have had mainly fluvial/alluvial and tectonic geomorphological features, but so far not any volcanic ones. The image here is a maar, a volcanic feature generated by phreatomagmatic eruptions due to the interaction of groundwater with magma. This example is the Álvarez Maar from the Michoacán-Guanajuato volcanic field in Mexico. The feature sits on a dry plain in the Valle de Santiago area but water tends to collect in the crater making more fertile soil for agriculture. You can explore the Michoacán-Guanajuato volcanic field on flashearth here.