National and Kapodistrian University of Athens — 190 years, 1837–2027

A WebGIS · 2026

Tombolos
of Earth

Explore Earth’s tombolos and the coastal features they connect. The current dataset covers Greece, documenting dimensions, morphology, present submergence, and projected inundation by 2100 under two scenarios of rising sea levels.

Sites mapped 233

Regions covered Greece

Web platform

Cite the interactive website and interface.

Evelpidou, N., Karkani, E., Saitis, G., Spyrou, E., & Liaskos, A. (2026). Tombolos [Interactive WebGIS]. evelpidou.geo.nkua.cloud/tombolos

Author affiliation
National and Kapodistrian University of Athens

Research publication

Cite the publication used by this catalogue.

Maroukian, H., Spyrou, E., Tsiatoura, S., Tzouxanioti, M., & Evelpidou, N. (2024). Sea Level Rise and the Future of Tombolos: The Case of Greece. Journal of Marine Science and Engineering, 12(9). https://doi.org/10.3390/jmse12091578

Licence & reuse

Terms for original platform content.

Except where third-party data, basemaps, imagery, logos, or source materials are separately credited, the original text, interface, visualisation design, and research outputs of this application are licensed under the Creative Commons Attribution 4.0 International licence (CC BY 4.0).

You may share and adapt this material provided that you give appropriate credit, link to the licence, and indicate whether changes were made. Third-party materials remain subject to their respective terms and licences.

Submit a tombolo or a correction to an existing landform. Include its location and supporting source, then add documented dimensions, connection type and submergence assessments.

Prepare your submission

Fill in the blank Data sheet in the XLSX workbook. The Field guide describes every column, its units and examples. You can also use the CSV with the same headers.

Leave unknown values blank. For a correction, include the existing id and explain the change in submission_notes.

Download XLSX Download CSV Send by email

Required fields

Field and column	Format and unit	What to provide
Tombolo name `name_en`	Text	Landform name in English or its established international spelling.
Country `country`	Text	Country containing the submitted site. Contributions are not limited to the current geographic coverage.
Administrative area `prefecture_en`	Text	Prefecture, region or equivalent administrative area in English.
Latitude `latitude`	WGS84 (degrees)	WGS84 decimal latitude. Use a minus sign south of the equator.
Longitude `longitude`	WGS84 (degrees)	WGS84 decimal longitude. Use a minus sign west of Greenwich.
Supporting source `reference`	Text	Traceable publication, DOI, report or source URL supporting this record. Include page or figure numbers where relevant.

Optional fields (19)

Field and column	Format and unit	What to provide
Existing record ID `id`	Whole number	For a correction, copy the ID of the existing map record. Leave blank for a new record.
Greek name `name_gr`	Text	Greek name where applicable.
Greek administrative name `prefecture_gr`	Text	Greek administrative area name where applicable.
Island or mainland `island_en`	Text	Name of the island or mainland containing the site.
Greek island name `island_gr`	Text	Greek island name where applicable.
Length `length_m`	Decimal (m)	Measured tombolo length.
Tombolo width `width_tombolo_m`	Decimal (m)	Measured width of the connecting landform.
Mainland side width `width_continent_m`	Decimal (m)	Measured width at the mainland side where applicable.
Island side width `width_island_m`	Decimal (m)	Measured width at the island side where applicable.
Height `height_m`	Decimal (m)	Reported landform height. State its reference in submission_notes.
Elevation `elevation`	Decimal (m)	Reported landform elevation. State its vertical datum in submission_notes.
Type `tombolo_type`	Text	Reported morphological type. Preserve the classification used by the supporting study.
Connection category `tombolo_category`	Text	Reported coastal connection category. Explain codes and their source in submission_notes.
Currently submerged `submerged`	yes / no	Present submergence documented at the observation date. Enter yes or no only when established. Leave blank if unknown.
RCP 2.6 submergence `sub_rcp26`	yes / no	Projected submergence by 2100 under RCP 2.6. Enter yes or no only when established. Leave blank if unknown.
RCP 8.5 submergence `sub_rcp85`	yes / no	Projected submergence by 2100 under RCP 8.5. Enter yes or no only when established. Leave blank if unknown.
RCP 2.6 elevation `elevation_rcp26`	Decimal (m)	Projected relative elevation in 2100 under RCP 2.6. Negative values are valid.
RCP 8.5 elevation `elevation_rcp85`	Decimal (m)	Projected relative elevation in 2100 under RCP 8.5. Negative values are valid.
Submission notes `submission_notes`	Text	Explain corrections, coordinate accuracy, measurement methods, vertical datum and any uncertainty. Identify attachments here.

Site guidance

Use the local administrative area in prefecture_en. Submissions may cover countries beyond the current dataset.
Document the vertical datum and the distinction between height and elevation in submission_notes. Do not interchange these measurements.
RCP 2.6 and RCP 8.5 fields describe assessments for 2100. Keep present submergence separate from projected submergence and provide the source of the assessment.
Boundary geometry can be attached as GeoJSON in WGS84, linked to the landform name or existing record ID.

Include contributor names, affiliation and contact details in your email. Attach the completed file and supporting sources manually. The research team reviews each submission before publication.

Sources & citations

Submit Tombolos data

Prepare your submission

Required fields

Site guidance