So I tinkered with the section a bit and came up with a (crude) potential layout that cuts down on the empty space while still displaying all of the Tributaries:
It's nothing major and I'm not certain how easy it would be to rearrange the layout (especially if it has to be different for mobile users; maybe have it wrap to screen size accordingly?), but I figured something like this may look more aesthetically pleasing to new and old members alike (and doesn't stretch the page/potentially hide the 'Welcome' section).
