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Hi, this parameter is added by WooCommerce when you set the option “Default customer location” to “Geolocate (with page caching support)”.

https://developer.woocommerce.com/2015/07/02/making-geolocation-static-cache-friendly-in-2-4/

Set this option to “Geolocate” and enable the option “Load product price in the background” at WooCommerce > Settings > Zone pricing.
https://www.pricebasedcountry.com/docs/getting-started/geolocation-cache-support/#section-2