Large Magellanic Cloud

Between the Large and Small Magellanic Clouds, there is a belt of hydrogen that connects both galaxies.

An excerpt from the article 16 facts about Large Magellanic Cloud

There are numerous stars inside the gas belt, concentrating in two places in the belt in the so-called islands consisting of larger clusters of stars. Polish astronomers from the University of Warsaw Observatory are behind the discovery of the belt connecting both galaxies.