This land formation is an example of what happens when natural and unnatural geological features come together. And if you think that looks strange, check out the rest of our gallery.

Over at the freaking awesome geology blog Pathological Geomorphology, October was the month for discussing images of landscapes where human-made features overlap with, and sometimes compliment, natural land features. Click on each image below to find out more about what it shows. See more amazing images via the Pathological Geomorphology blog.

This image of Idaho farms shows what happens when you use "center pivot" irrigation on your farm in the middle alluvial fans - areas where mountain streams spread out across a flat plane in a fan shape. "I love the way the center-pivot irrigation boundaries outline the edges of the alluvial fans," says Anne Jefferson.

Here you can see a few of the circular farm areas are neatly cut off on one side. "You can see some incomplete irrigated circles, where presumably the alluvial fan is too active to allow agricultural productivity," Jefferson adds.

Here's another alluvial fan, in Afghanistan. Because these trickles of water across the desert may be the only regions where plants can grow, you see a pattern of farms growing like veins in the shape of the fan. Kyle House writes, "Alluvial fans are often milked for all they are worth in many of the world's deserts. Particularly well-watered fans display a remarkable palimpsest of culture and fluvial geomorphology." The

Another alluvial fan, this time in China. You can see the patchwork farms molded into the shape of the mountain runoff.

Here, an ancient volcano in Mexico has become a fertile field for farmers. You can see the old shape of the volcano cradling the crop fields. Says Ian Stimpson, "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."

And here's the image that started the month-long theme - it shows the way a town called Green River (next to Utah's Green River) has molded itself to reflect the path the river once took. You can see how a golf course and parts of the town curve into a shape that reveals the river's former path. Says Brian Romans, "I like how the shape of the land use, including a golf course in the lower part of the image, is dictated by the abandoned meander bend."