Oud-Aa is a hamlet in the Dutch province of Utrecht (province). It is a part of the municipality of Stichtse Vecht, and lies about 13 km northeast of Woerden.

Oud-Aa
Hamlet
Farm in Oud-AA
Oud-Aa Location in the Netherlands Show map of Utrecht (province) Oud-Aa Oud-Aa (Netherlands) Show map of Netherlands
Coordinates: 52°10′48″N 4°58′19″E
Country	Netherlands
Province	Utrecht
Municipality	Stichtse Vecht
Area [1]
• Total	3.24 km2 (1.25 sq mi)
Population  (2021)[1]
• Total	135
• Density	42/km2 (110/sq mi)
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	3621[1]
Dialing code	0346

The hamlet was first mentioned in 1138 as "juxta lacum qui vocatur A", and refers to the Aa River which is a tributary of the Angstel River. Oud (old) has been added to distinguish from Nieuwer-Ter-Aa.[2] The postal authorities have placed it under Breukelen,[3] and there are no place name signs. The castle Ruwiel was located in Oud-Aa, however it was destroyed in 1673 by the French, and now contains a farm. In 1840, it was home to 315 people.[4]

• 
  Former Ruwiel Castle seen from the east, 1646-1647
• 
  1865 map of Oud Aa with castle remains
• 
  Sketch map of the former Ruwiel Castle islet, 2022
• 
  Former Ruwiel Castle islet seen from the southwest, 2022
• 
  Former Ruwiel Castle islet seen from the southeast, 2022

References

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