Marine Tour

The Marine Tour was the twenty-first tour of Mario Kart Tour, which began on July 1, 2020 and ended on July 14, 2020. Due to being aquatic-themed, the tour introduced Rosalina in a teal swimdress adorned with Grand Stars and Mario in his swimwear from Super Mario Odyssey as the new spotlight drivers of the tour, while also adding in fish-themed kart parts such as the Cheep Snorkel and the Manta Glider. Additionally, Koopa Troopa Beach 2 from Super Mario Kart was introduced as the signature course of this tour since its last appearance in Mario Kart DS. The menu's background featured a few islands from Koopa Troopa Beach 2 as the landmark for this tour.

Signature kart sets
Drivers with a corresponding cup in the tour were bumped one rank up in every course of their cup.

Rewards
Gold cells indicate rewards exclusive to Gold Pass members.

Profiles

 * Mario Kart Tour Twitter:
 * "The Peach Tour is drawing to a close in blue. Can you take the summer heat? Starting Jun. 30, 11 PM PT, these two shaded swimmers will splash and dash their way onto the track. Get ready for the Marine Tour!"
 * "It's time for the Marine Tour! Summer has come to blue, and our drivers are ready to hit the Koopa Troopa Beach for some sizzling-hot races!"
 * "The Marine Tour is almost over. Thanks for racing! Anyone up for some adventure? Next up in blue is the Exploration Tour!"

Trivia

 * The Glider Challenge of this tour ended in a Sydney Ferry, hinting at an upcoming Sydney-based course, revealed to be Sydney Sprint several months later.
 * This was the first tour to lack a Do Jump Boosts bonus challenge.
 * Despite Funky Kong and Dixie Kong not being obtainable (with the former being obtainable in pipes starting from the 2021 Cat Tour and the latter being obtainable in pipes starting from the Bowser vs. DK Tour), they still appear on the course icons of this tour.