R-class (Regatta-class) · Caribbean & Repositioning
About Sirena
Sirena was delivered in 1999 as R Four, one of the eight R-class ships built for Renaissance Cruises, and sailed as Tahitian Princess and then Ocean Princess before Oceania Cruises acquired her in 2016. Norwegian Cruise Line Holdings has since signed an agreement to sell her: she stays with Oceania through her March 2028 deployment and then transfers to Ambassador Cruise Line, which plans to rename her Ambella. NCLH has described the sale as part of repositioning its luxury brands rather than a change of direction for Oceania.
Highlights
- Built 1999 as R Four; previously Tahitian Princess and Ocean Princess
- One of the eight R-class ships still in service across several lines
- Leaves the Oceania fleet after her March 2028 season
- Sold to Ambassador Cruise Line, to be renamed Ambella
Specifications
| Cruise line | Oceania Cruises |
|---|---|
| Ship class | R-class (Regatta-class) |
| Year built | 1999 |
| Shipyard | Chantiers de l'Atlantique, Saint-Nazaire |
| Gross tonnage | 30,277 GT |
| Guest capacity | 688 guests |
| Crew | 373 crew |
| Length | 181 m |
| Home port | Fort Lauderdale, FL |
| Region | Caribbean & Repositioning |
| Status | In service |
Specifications from Wikipedia: MS Sirena. Checked September 29, 2026.
At a glance
Derived from the specification table below.
- Space ratio: 44.0 GT per guest
- Gross tonnage divided by guest capacity — the standard measure of how much enclosed room each passenger has. Mainstream ships sit near 35; above roughly 50 is premium or luxury territory.
- Guest-to-crew ratio: 1.8 guests per crew member
- Fewer guests per crew member generally means more attentive service; mainstream ships are typically around 2.5 to 3.
- Age: 27 years since delivery
- Counted from the 1999 delivery year in the specification table below.
- Length: 181 m (594 ft)
- Overall length, which is what determines the berths and locks a ship can physically use.
How Sirena compares with the other ships profiled here
Measured against the six ships profiled on this site, Sirena is equal third for size, at 30,277 GT; third for guest capacity, at 688 guests; third for space per guest, at 44.0 GT per guest. Those six are the vessels this site keeps a profile on, not a survey of the industry, so the placings describe this table and nothing wider.
The closest comparable here by size is Azamara Quest, at the same 30,277 GT.
| Ship | Gross tonnage | Guest capacity | GT per guest | Guests per crew | Year built |
|---|---|---|---|---|---|
| Carnival Vista | 133,596 GT | 3,934 | 34.0 | 2.7 | 2016 |
| Marella Discovery | 69,130 GT | 1,830 | 37.8 | 2.5 | 1996 |
| Sirena | 30,277 GT | 688 | 44.0 | 1.8 | 1999 |
| Azamara Quest | 30,277 GT | 686 | 44.1 | 1.7 | 2000 |
| World Traveller | 9,934 GT | 200 | 49.7 | 1.5 | 2022 |
| Heritage Discoverer | 6,158 GT | 144 | 42.8 | 1.2 | 1989 |
Every figure is taken from the specification table on each ship's own profile, and each profile names its source. GT per guest and guests per crew are calculated from those figures.
Sirena: frequently asked questions
How big is Sirena?
Sirena measures 30,277 gross tons, is 181 metres (594 feet) long, and carries up to 688 guests.
How many passengers does Sirena carry?
Sirena has a guest capacity of 688. A crew of 373 looks after them, about 1.8 guests per crew member.
Which cruise line operates Sirena?
Sirena is operated by Oceania Cruises and belongs to the R-class (Regatta-class).
When was Sirena built?
Sirena was delivered in 1999 by Chantiers de l'Atlantique, Saint-Nazaire, making it 27 years old.
Where does Sirena sail?
Sirena is deployed in the Caribbean & Repositioning region, sailing from Fort Lauderdale, FL.