GEOS and Shapely installation on Windows

Uninstall shapely and try to install it from here. Hope it helps. It worked for me.

The geos_c.dll needs to be in your %PATH%. Per default, OSGeo4W installs directly under C:. If you did that, add C:\OSGeo4W64\bin to your %PATH% : right-click on "This PC"->Advanced System Settings->Environment Varialbes. Setting it only for or system-wide will both work - take your pick. Restart your console and conda install shapely should work.

I was having the same problem but now everything is working perfectly. You can download the shapely package (in wheel package) from the link shared by Mario Miler (link) Choose you package according to your windows and python version. Download the file, it has .whl extension. It is file format for python Wheel package.

Go to cmd and enter:

pip install wheel

Then cd to the folder where you have downloaded and enter

pip install 'your_package_full_name'.whl