It is a residential community on the English North Sea drift in the Waveney area of Suffolk.
It lies at the mouth of the River Blyth inside the Suffolk Coast and Heaths Area of Outstanding Natural Beauty.
The town is located in London inside the parliamentary supporters of Suffolk Coastal, around 11 miles 18 km south of Lowestoft, 29 miles 47 km north-east of Ipswich and 97 miles 156 km north-east.
The "Every Usual Resident" 2011 Census figure gives an aggregate of 1,098 people for the town.
The 2012 Housing Report submitted by the Reydon Society and Southwold reasoned that 49 for each penny of the living arrangements in the town are used as second homes and let to event creators.