Garston is a small settlement in northern Southland, in the South Island of New Zealand, located close to the region's boundary with Otago. It i…Garston is a small settlement in northern Southland, in the South Island of New Zealand, located close to the region's boundary with Otago. It is the most inland settlement in New Zealand. It is situated south of Lake Wakatipu and close to the upper reaches of the Mataura River, between Kingston and Lumsden. Garston is connected to both Kingston and Lumsden by SH 6.