As of 2026, Port Lympne Safari Park in Kent is widely considered the largest wildlife reserve in the UK, spanning over 600 acres of "Kentish Savannah." Unlike a traditional zoo, Port Lympne allows animals to roam in massive, naturalistic habitats. It is home to more than 900 animals and over 75 species, including the largest herd of black rhinos in the UK. Visitors typically explore the vast grounds via a truck-based safari tour that provides an experience similar to an African game drive. Another top contender often mentioned is Knowsley Safari Park near Liverpool, which features a famous 5-mile drive-through safari that is the longest in the UK. While Whipsnade Zoo also covers 600 acres, Port Lympne is specifically marketed and designed as a "safari reserve," prioritizing expansive, open-plain environments and high-end conservation lodging like the "Lion Lodge" where guests can sleep next to the lions.