It's challenging to pick just three, as there are many regional variations of Spanish across the world. However, here are three notable ones:
1. Castilian Spanish: Spoken in Spain (and some parts of Latin America), this is often considered the "standard" form of Spanish, although many consider it just another dialect.
2. Andalusian Spanish: A distinct dialect spoken in southern Spain, characterized by a unique pronunciation and vocabulary.
3. Mexican Spanish: This dialect is spoken in Mexico and has distinctive features, including its own vocabulary and pronunciation.
It's important to note that these are just a few examples, and there are many other fascinating regional variations of Spanish across the globe.