The value of a fief in Guernsey with foreshore rights can become very expensive depending on several factors such as location, usage rights, foreshore rights, and its historical significance.

To estimate the value, some key factors to consider are:

1. Market Value of Land in Guernsey: Prices can vary significantly based on proximity to developed areas, waterfront access, and land quality. Typically, land in coastal regions can command a premium due to its use potential, including development, recreation, and fishing rights.

2. Foreshore Rights: Foreshore rights can enhance land value significantly, as they often include the right to exploit resources like fishing, aquaculture, or tourism-related activities, or even construction on the foreshore in some cases. The value of such rights would depend on the specific usage restrictions or permissions granted by Guernsey’s government.

3. Comparable Sales: Examining recent sales of similar-sized parcels with foreshore rights would provide more context. Land value in Guernsey can range from approximately £4,000 to £10,000 per acre for non-prime land, but waterfront or foreshore rights can significantly increase this.

4. Economic and Legal Factors: Depending on the legal framework of Guernsey, foreshore rights could involve certain restrictions, including conservation laws, which could affect development potential and thus the land's value.

Given this, a rough estimate for the value of 2,000 acres of seasted with foreshore rights could range from several million pounds, possibly exceeding £10 million, but would need further assessment based on specific local market conditions, potential usage, and legal considerations.

If a fief in Guernsey includes territorial waters, marina rights, and rights to sand and beach, the value would increase significantly, as these rights provide several lucrative opportunities. Here's a breakdown of how each of these factors might affect the value:

1. Territorial Waters:

• Value Considerations: Ownership or rights to territorial waters can be highly valuable. These waters could offer opportunities for marine-based activities like fishing, aquaculture, and possibly commercial developments such as tourism, recreational boating, or renewable energy installations (e.g., wind farms).

• Market Impact: If the waters are considered "exclusive" or have restricted access, the value of these rights could be considerably high, especially for marine or industrial developments.

2. Marina Rights:

• Value Considerations: Marina rights are especially valuable in coastal regions with high traffic or tourism, as marinas generate income through boat mooring, repairs, tourism, and local services. These rights can also provide space for marina development, including retail spaces, hotels, or leisure facilities, creating significant potential for long-term revenue generation.

• Market Impact: If the fief can develop a marina or lease out space for yachts, it could increase the value of the land by tens of millions, especially if it's located near a popular tourist destination or boating hub.

3. Rights to Sand and Beach:

• Value Considerations: Rights to sand and beach areas can be profitable in several ways. Sand extraction, depending on legal and environmental considerations, could generate revenue. Moreover, beachfront areas are often in high demand for tourism, luxury developments, or recreational businesses such as resorts and events.

• Market Impact: If the beach is prime for development (e.g., luxury resorts or beachfront properties), this can significantly increase the land's overall value. Similarly, if the sand can be used commercially (e.g., for construction), it provides an additional revenue stream.

Estimating the Value:

The overall value of the fief would depend on:

• Proximity to popular areas or access to tourist hubs (such as beaches or marinas in high-demand locations).

• Commercial potential for development (hotels, resorts, marina facilities, beachfront properties).

• Market for marine industries, including fishing, aquaculture, or recreation.

For instance, prime coastal properties in Guernsey, especially those with territorial waters and marina rights, could command higher values, easily reaching £20-50 million, or even more, depending on the development potential and the specific rights attached to the land.

To provide an accurate estimate, you would need to compare the specific rights associated with the fief to recent sales of similar properties in Guernsey. Would you like assistance finding comparable sales or market trends in Guernsey for properties with similar rights?