Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Rooms ( roomName VARCHAR, RoomId VARCHAR )
TABLE: CREATE TABLE Reservations ( Room VARCHAR )

### Question ###
Find the most popular room in the hotel. The most popular room is the room that had seen the largest number of reservations.

### Accurate SQL ###

SELECT T2.roomName FROM Reservations AS T1 JOIN Rooms AS T2 ON T1.Room = T2.RoomId GROUP BY T1.Room ORDER BY COUNT(*) DESC LIMIT 1