Places where swans are kept or raised.
Swanneries are usually peaceful and beautiful places.
Examples:
The swanneries by the lake are very pretty.
We visited the swanneries and saw many swans.
The queen owns several swanneries.
The swanneries are like a palace for swans.
The swanneries have so many swans, it's like a swan party every day.
I dream of living near the swanneries.