Tower Hill is a major natural landmark on the Princes Highway between Warrnambool and Port Fairy in south-western Victoria. The State Game Reserve occurs on the southern edge of the western Victorian volcanic plains at 38° 19' latitude and 142° 22' longitude and is a large nested maar volcano approximately 3kms by 2kms which erupted about 25,000 years ago. Tower Hill is a wetland reserve of approximately 610 hectares with half of the area being crater banks or islands in the shallow waters. Many people visit it to enjoy a picnic or walk, to see its wildlife or to study its geology.