diff --git a/prepare/build.gradle b/prepare/build.gradle
index d1e6caa..322fff3 100644
--- a/prepare/build.gradle
+++ b/prepare/build.gradle
@@ -15,6 +15,7 @@ dependencies {
 	implementation 'org.apache.logging.log4j:log4j-core:2.17.2'
 	implementation 'org.slf4j:slf4j-simple:1.7.36'
 	implementation 'net.sourceforge.argparse4j:argparse4j:0.9.0'
+	implementation 'org.json:json:20220320'
 }
 
 sourceSets {
diff --git a/prepare/src/main/guessNNprepare/NamedEntity.scala b/prepare/src/main/guessNNprepare/NamedEntity.scala
index 23155aa..d8e5cab 100644
--- a/prepare/src/main/guessNNprepare/NamedEntity.scala
+++ b/prepare/src/main/guessNNprepare/NamedEntity.scala
@@ -1,8 +1,18 @@
 package guessNNprepare
 
-import org.apache.jena.rdf.model.Resource
+import org.apache.jena.rdf.model.{Resource, ResourceFactory}
+import org.json.{JSONException, JSONObject}
 
-class NamedEntity(val rdfResource: Resource, val Name: String, val readableType: String) {
+import scala.util.{Failure, Success, Try}
+
+class NamedEntity(val rdfResource: Resource, val name: String, val readableType: String) {
+
+	def json: JSONObject = {
+		new JSONObject()
+			.put("name", name)
+			.put("type", readableType)
+			.put("uri", rdfResource.getURI)
+	}
 
 
 	def canEqual(other: Any): Boolean = other.isInstanceOf[NamedEntity]
@@ -20,3 +30,17 @@ class NamedEntity(val rdfResource: Resource, val Name: String, val readableType:
 	}
 }
 
+object NamedEntity {
+	def apply(json: JSONObject): Try[NamedEntity] = {
+		try {
+			Success(new NamedEntity(
+				ResourceFactory.createResource(json.getString("uri")),
+				json.getString("name"),
+				json.getString("type")
+			))
+		} catch {
+			case e: JSONException => Failure(e)
+		}
+	}
+}
+
diff --git a/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala b/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala
index 26e2633..61f8f73 100644
--- a/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala
+++ b/prepare/src/main/guessNNprepare/mains/ExtractEntities.scala
@@ -6,8 +6,9 @@ import net.sourceforge.argparse4j.inf.{ArgumentParser, Namespace}
 import org.apache.jena.query.QueryExecutionFactory
 import org.apache.jena.rdf.model.{InfModel, Model, ModelFactory}
 import org.apache.jena.reasoner.ReasonerRegistry
+import org.json.JSONArray
 
-import java.io.InputStream
+import java.io.{FileWriter, InputStream}
 
 object ExtractEntities extends MainCommand {
 
@@ -39,7 +40,16 @@ object ExtractEntities extends MainCommand {
 			getMondialNamedEntities(kg, "Sea"))
 			.distinct
 		printf("Found %d guessable named entities\n", guessableEntities.size)
-		println(s"They would be written to ${jsonFilePath} (not implemented yet)")
+
+		println(s"Writing entities to ${jsonFilePath}")
+		val jsonEntities:JSONArray = new JSONArray()
+		guessableEntities.foreach(e => jsonEntities.put(e.json))
+		val writer = new FileWriter(jsonFilePath)
+		jsonEntities.write(writer)
+		writer.flush()
+		writer.close()
+
+		println("Done.")
 	}
 
 	def getMondialNamedEntities(kg: Model, prefixedType: String): List[NamedEntity] = {