In the 86 years since Pluto's discovery, we have had no idea what it looked like; now NASA's New Horizons mission has graced the world with incredibly detailed images of the surface of Pluto and its moon Charon. These previously unknown surface features need to be named.

The New Horizons team has no shortage of potential options. In early 2015, the mission asked the world to submit names corresponding to specific thematic guidelines. The initial list of the most popular names was released earlier this month.

These names won't become official until they're ratified by the International Astronomical Union (IAU). In the meantime, the team has needed a way to refer to the various features they are studying. “We need names to call things,” Cathy Olkin, a New Horizons scientist who was part of the group in charge of assigning informal names, told BuzzFeed Science. “We are working with these data. You can’t just keep on saying, ‘Oh, that canyon up to the left.’”

Over the past couple of weeks, as new images have come in, the teams have compiled informal maps complete with preliminary names for both Pluto and Charon. BuzzFeed Science has obtained copies of these maps.

Though not officially approved by the IAU, the names on these maps are what will be submitted to the IAU for ratification, and they offer an early look at what official maps of Pluto and Charon may look like in the future.