Which parts of England mostly supported Charles I during the first English Civil War?

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Painting of the Battle of Naseby shows cavalry and infantry clashing, with soldiers on horseback leading a charge and fallen fighters on the ground amid the chaos of battle. — English Civil Wars *Battle of Naseby*, by an unknown artist. The victory of the Parliamentarian New Model Army, under Sir Thomas Fairfax and Oliver Cromwell, over the Royalist army, commanded by Prince Rupert, at the Battle of Naseby (June 14, 1645) marked the decisive turning point in the English Civil War.

During the first English Civil War, King Charles I primarily drew his support from the north and west of England, as well as from Wales. Following 1643, he also received support from Ireland.1

While the King established his headquarters in Oxford, his control was largely limited to these regions. In contrast, the Parliamentarians held the wealthier southern and eastern parts of the country, which included the financial capital of London and most of the kingdom's key ports. This geographical divide was a significant factor in the conflict, as Parliament’s control over these economically vital areas provided them with a distinct advantage in sustaining their military efforts.1