There are seventeen autonomous regions in Spain (plus the two autonomous cities of Melilla and Ceuta). Some of these regions are large: Andalucía comprises eight provinces, Castilla y León has nine, and others are small – such as Madrid, La Rioja, Murcia plus another four, which are all uni-provincial.
Each region has its own government and president.
Right now, we are in election mode in some of the autonomies (every four years unless called before). Extremadura with two provinces just had theirs in December – although the problem in the capital, Mérida, arises with the third party, Vox, insisting on various functions within the minority government of María Guadiola (PP) in exchange for their support. 
The final outcome remains unclear – and Extremadura could soon be called to the polls again.
Aragón is controlled by the PP and is currently in campaign mode for February 8th. It looks like Jorge Azcón will be returned, but as above, will need the support of a revitalised Vox. The Vox candidate Alejando Nolasco is a little extreme, describing the regional PP as ‘pro Islam’, according to one of the local news-sites.
Meanwhile, the candidacy of a PSOE government minister, Pilar Alegría, probably won’t be of much help for the party’s chances. The far-left once again refuses to join together (a bit like the Life of Brian’s joke of the antipathy between the People’s Front of Judea and the Judean People’s Front). Thus: IU and Sumar on the one hand, la Chunta Aragonesista on the other and Podemos bringing up the rear.
Aragón is three provinces, with its capital in Zaragoza.
The next up – for March 15th – is another PP stronghold, with Alfonso Fernández Mañueco (PP) holding the keys to Castilla y León. His problem might be the disastrous summer fires throughout the region, badly mismanaged by Mañueco and his team. Nevertheless, he will likely win say the experts (with the support or otherwise of Vox). The capital of this, the largest region of Spain with nine provinces (although the three western provinces of León, Salamanca and Zamora all want to leave) is Valladolid.
Finally, we come to Andalucía – yet again held by the PP. The president is Juanma Moreno and is seen as one of the two leading candidates (along with Madrid’s Ayuso) to take over the party nationally when Feijóo throws in the towel. The PSOE candidate is the heavyweight María Jesus Montero, the current Minister for Hacienda and vice-president of Spain. The date is sometime in June.
There could be the chance of an early surprise general election on the same day as the Andalusian ballot – depending on events and Pedro Sánchez.
In all these regions – as indeed elsewhere – the key to the throne-room appears to be in the hands of Santiago Abascal’s Vox party. In an uncomfortable alliance with the PP (which must make allowances and exceptions), Spain is approaching a difficult time.