This page explains how to find the Raqa Zunzo shrine.
How to Find the Shrine
Before you can challenge this shrine, you have to reach Gerudo Town and free Divine Beast Vah Nabooris. After that, you have to win the Sand-Seal Rally south of Gerudo Town. If you complete the rally in under 90 seconds, you can place the orb on the pedestal to reveal the shrine.
The Shrine's Reward
The treasure chest in the shrine contains a Radiant Shield.