@FormularSumo @andypiper masto.es is a general Spanish-speaking Mastodon server. It was opened on November 2022 (the largest Twitter exodus), with the intention of becoming the best place to start for Spanish-speaking people.
It quickly became the largest Mastodon server in Spanish and it has maintained that position ever since.
But the Spanish-speaking Fediverse goes way beyond masto.es. Here is a list of instances you may want to know about https://notas.niboe.org/s/6lr2U2myb