Depends on the terminology they were using, but, the original Ovoid was derived from the results of the Stage 1 Titan 24 Survey. It was 1450M X 400M X 400M (approx)

The latest anomaly we talk about quite often, following Stage 1 & 2, is the Zona Central Anomaly. It is 1800M X 1700M X 1300M and open @ depth. (This 1 anomaly is just under 4 Billion cubic meters, huge!)